Self-locking stepless adjustment device for the initial reaction force of the backrest swivel chair swinging back and forth

Abstract

The invention discloses a self-locking steplessly adjusting device for backrest swivel chair forward and backward swinging initial opposite force.When backrest swivel chair swinging opposite force is adjusted through a rotating nut, a user needs to bend; during forward and backward swinging, a thread pair is loosened, so that the user comfort becomes poor, and even the user is scared when sitting on a chair and feeling empty.A hinge is fixedly installed at the bottom of an installation base plate.The front portion of a shell is hinged to the hinge, the middle of the shell is fixedly connected with a gas rod, and the rear portion of the shell is provided with a worm gear operated mechanism; a worm shaft is supported on the shell through a first rolling bearing, and a hand wheel is fixedly connected to the rear end of the worm shaft; the worm shaft is fixedly sleeved with a worm; a worm wheel shaft is supported on the shell through a second rolling bearing; a worm wheel is fixed to the worm wheel shaft and meshed with the worm; the worm wheel shaft is sleeved with a torsional spring, one end of the torsional spring is connected to a hole formed in the end face of the worm wheel, and the other end of the torsional spring is connected to the bottom of the installation base plate.According to the self-locking steplessly adjusting device, a user does not need to bend, the user-friendly requirement is met in a steplessly-adjusting mode, and the self-locking performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of office supplies, and in particular relates to a self-locking stepless adjustment device for the initial reaction force of the backrest swivel chair swinging back and forth. Background technique [0002] After sitting on the swivel chair, the user can swing back and forth within a small range of angles. When swinging backwards, there is always a reverse force, and the size of the reverse force increases with the increase of the swing angle, thereby increasing comfort. At present, the initial magnitude of this reverse force is adjusted by turning the nut to adjust the preload of the compression spring installed between the screw and the nut, thereby adjusting the initial preload. However, this structure is troublesome to operate, because the compression spring is in a vertical state, and the user has to bend over when turning the nut; and when swinging back and forth, the load change causes the thread pair...

AI Technical Summary

Problems solved by technology

However, this structure is troublesome to operate, because the compression spring is in a vertical state, and the user has to bend over when turning the nut; and when swinging back and forth, the load change causes the thread pair to loosen, and the initial preload of the compression spring becomes less and less. As a result, the comfort of the user when swinging back and forth in the sitting position is poor, and even the backrest feels empty, causing fright

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